16813640 has 16 divisors (see below), whose sum is σ = 37830780. Its totient is φ = 6725440.

The previous prime is 16813637. The next prime is 16813661. The reversal of 16813640 is 4631861.

It can be written as a sum of positive squares in 2 ways, for example, as 15888196 + 925444 = 3986^2 + 962^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210131 + ... + 210210.

Almost surely, 2^16813640 is an apocalyptic number.

16813640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16813640 is an abundant number, since it is smaller than the sum of its proper divisors (21017140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16813640 is a wasteful number, since it uses less digits than its factorization.

16813640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420352 (or 420348 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 16813640 is about 4100.4438784112. The cubic root of 16813640 is about 256.1851281353.

The spelling of 16813640 in words is "sixteen million, eight hundred thirteen thousand, six hundred forty".